#include <stdio.h>
int main(int argc, char const *argv[])
{
    char a, b;
    printf("请输入四个字符>:");
    scanf("%3c%c", &a, &b);
    printf("a=%c,b=%c\n", a, b);

    long c;
    printf("请输入一个long类型整数>:");
    scanf("%ld", &c);
    printf("c=%ld\n", c);

    double d;
    printf("请输入一个double类型整数>:");
    scanf("%lf", &d);
    printf("d=%lf\n", d);

    return 0
}
